JPH0632436A - Powder supply device - Google Patents

Abstract

PURPOSE:To prevent powder from aggregating due to charge with static electricity by letting both a rotary disc and a casing be made of conductive material, making the casing possible to earth, and thereby making both the disc and the casing free of static electricity generated by the rotation of the rotary disc. CONSTITUTION:A rotary disc 24 having a circumferential groove is rotatably mounted in the inside of a casing 30, a nozzle plate body 50 provided with a powder filling port 54 and a powder feed port 56, is arranged over the rotary disc, and a powder feed device A is made up of a hopper 82 to which powder is filled up, and of a powder feed pipe 76 guiding powder outside, which is forwarded out of the circumferential groove. Both the disc 24 and the casing 30 are made of conductive material, and an earth line A1 capable of earthing the casing 30 and an earthing member capable of earthing the disc 24 and the casing 30, are provided. By this constitution, static electricity generated by the rotation of the disc 4 can be set free through the disc 24 and the casing 30, and there is thereby no fear of the aggregation of powder which is filled in the circumferential groove, due to charge with static electricity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder supply device, and more specifically, it is intended to measure or visualize the speed of a powder supply device used for thermal spraying or a powder composed of a large number of tracer particles. The present invention relates to a powder supply device for quantitatively supplying a fluid such as a gas and a liquefied gas.

[0002]

2. Description of the Related Art Tracer particles are generally used for measuring fluids using a laser Doppler velocimeter or photography.

That is, a certain amount of powder consisting of a large number of racer particles is mixed into a fluid such as a gas or a liquefied gas to be measured, and the fluid velocity is measured from the flow velocity of the tracer particles. In addition, the flow distribution of the fluid is measured by photographing the tracer particles that flow with the fluid to visualize the fluid.

Such tracer particles are required to be uniform, non-aggregating, and have a low bulk specific gravity. How to supply such tracer particles to a fluid to be measured in a fixed amount is required. The problem is greatly related to the accuracy and efficiency of the above measurements.

A conventional powder feeder 100 will be described with reference to FIGS. 13 to 15. As shown in FIG. 13, a disk 102, which is rotated by driving a motor, is attached inside the casing 106 of the apparatus main body 101 while maintaining a horizontal state. A circumferential groove 103 extending in the circumferential direction is engraved on the upper surface of the disc 102. Reference numeral 104
Is a hopper filled with the powder F. The lower portion 104a of the hopper 104 is tapered toward the lower side, and the lowermost end portion 104b thereof is formed in the circumferential groove 1
It opens just above 03. Reference numeral 104c indicates the opening. That is, the powder F is the hopper 1
From 04 through the opening 104c, the circumferential groove 103 is filled.

Reference numeral 107 is a blow-off nozzle made of a plate. As shown clearly in FIG. 14, the blow-out nozzle 107 has a fan shape in a plan view, and a concave portion 1 having an inclined side surface 108 inclined in a taper shape in a substantially central portion.
09 is provided, and at the center of the recess 109, a powder flow hole 110 that penetrates in the thickness direction is provided.

Although the blow-out nozzle 107 is mounted on the disk 102, it is fixed to the casing 106 by a suitable mounting means such as a screw, so that the disk 102 rotates. Even so, the blow-out nozzle 107 does not rotate.

Reference numeral 105 denotes a powder supply passage which penetrates the casing 106 of the apparatus body 101 and allows the inside and outside of the apparatus body 101 to communicate with each other. This powder supply passage 105 is
It is attached to the blowing nozzle 107 so as to be able to communicate with the powder flow hole 110.

The casing 106 comprises a casing upper member 106a and a casing lower member 106b, and the casing upper member 106a is the main body 101 of the apparatus.
It is made of a transparent or translucent molded body made of, for example, acrylic resin so that the inside of the can be visually inspected.

The air pressure inside the apparatus body 101 is
It is higher than the outside air pressure. Due to this pressure difference, the air enters from the point X in the circumferential groove 103, which comes into contact with the blow-out nozzle 107, and then flows into the circumferential groove 103 located below the blow-out nozzle 107, through which the powder flow holes 110 and It flows into the powder supply passage 105 through the recess 109,
There will be a flow of air that goes out of the. The arrow in FIG. 15 indicates the flow of air.

In the powder supply apparatus 100 having the above-mentioned structure, the powder F is placed on the air flow as described above, and a fixed amount of powder F is supplied.
Is expected to be supplied to the outside of the apparatus main body 101.

By the way, the powder supply device 10 of the above type
In the case of 0, the disk 102 slides on the lower surface of the blowing nozzle 107 as the disk 102 rotates. It is well known that static electricity is generated by friction caused by such sliding, and the disk 12 is gradually charged.

However, the conventional powder supply device 100
In that case, the actual situation is that no measures have been taken to remove static electricity or prevent static electricity, and this has caused the following problems.

When the disk 102 is charged, this disk 10
The powder F filled in the circumferential groove 103 in No. 2 is charged with static electricity and aggregates, and the supply accuracy is reduced.

When the casing upper member 106a is charged as the disk 102 is charged, the casing upper member 106a is charged.
The powder F adheres to the inner surface of a, making it impossible to visually inspect the inside of the apparatus main body 101.

The hopper 10 is charged with the charging of the disk 102.
4. In particular, when the vicinity of the opening 104c of the hopper 104 is charged, the powder F adheres to the vicinity of the opening 104c, resulting in a problem that the peripheral groove 103 is not filled with the powder F.

When the powder supply passage 105 is charged due to the charging of the disc 102, the powder F adheres to the inner surface of the powder supply pipe 105 and the powder F adhered to the inner surface of the powder supply pipe 105. There was a problem that the powder F separated during the operation of the apparatus and the powder F could not be quantitatively supplied to the fluid.

[0018]

[Means for Solving the Problems] In order to solve the above problems, the following means were taken. The powder supply device according to claim 1 is a casing having a cylindrical shape with a bottom and a lid, a disc rotatably provided inside the casing, and a circumferential direction provided on an upper surface of the disc. An extending circumferential groove, a powder filling hole and a powder feeding hole which are arranged on the disk and fixed to the casing, and which penetrate through in the thickness direction, are provided at positions corresponding to the circumferential groove. A plate body, a hopper for filling the peripheral groove with the powder through the powder filling hole, and a guide for the powder delivered from the peripheral groove through the powder supply hole to the outside. A powder supply pipe, wherein at least the surface of the disk is made of an electrically conductive material, and a grounding member for grounding the disk is provided to rotate the disk. The static electricity generated on the disk is also grounded. It is obtained by allowing removal through.

According to a second aspect of the present invention, the casing is made of a conductive material, and an inner ground member for allowing the disc and the casing to conduct electricity and an outer ground member for grounding the casing are provided. It is preferable that the static electricity generated in the disk due to the rotation of the disk can be removed through the inner ground member, the casing, and the outer ground member.

According to a third aspect of the present invention, it is preferable that at least a part of the casing is composed of an inspection window made of a transparent material or a semitransparent material, and at least the inner surface of the inspection window is electrically conductive.

According to a fourth aspect of the present invention, the entire disc is made of a conductive material, and the sliding surface of the disc with respect to the plate body may be coated with a wear preventing coating.

In the powder supplying apparatus according to a fifth aspect of the present invention, a cylindrical casing having a bottom and a lid is formed, a disc rotatably provided inside the casing, and an upper face of the disc. A circumferential groove extending in the circumferential direction, a plate body disposed on the disk, and provided with a powder filling hole and a powder feeding hole, which penetrate through the disc in a thickness direction at positions corresponding to the circumferential groove, respectively, A hopper in a state of being connected to the plate body, for filling powder in the peripheral groove through the powder filling hole, and in a state of being connected to the plate body, from the peripheral groove to a powder supply hole A powder supply device having a powder supply pipe for guiding the powder sent out through the device to the outside of the device main body, wherein at least the surfaces of the disk and the plate body and at least the inner surface of the hopper are electrically conductive. Conductive material in the hopper made of material It will be ground member is provided to allow grounding more configuration portion, in which the static electricity generated in association with the rotation of the disk were to be removed through the hopper and said grounding member.

According to a sixth aspect of the present invention, it is preferable that at least a part of the hopper is made of a transparent body or a semi-transparent body, and at least the inner surface thereof has conductivity.

In the powder supplying apparatus according to the seventh aspect, a casing having a cylindrical shape with a bottom and a lid, a disc rotatably provided inside the casing, and an upper face of the disc are provided. A circumferential groove extending in the circumferential direction, a plate body disposed on the disk, and provided with a powder filling hole and a powder feeding hole, which penetrate through the disc in a thickness direction at positions corresponding to the circumferential groove, respectively, A hopper for filling the circumferential groove with the powder through the powder filling hole, and a powder which is in a state of being connected to the plate body and which is sent out from the circumferential groove through the powder feeding hole. A powder supply pipe for guiding the outside of the apparatus main body, wherein at least the surfaces of the disk and the plate body and at least the inner surface of the powder supply pipe are made of a conductive material, The part made of conductive material in the powder supply pipe It will be ground member is provided to allow the earth, is a static electricity generated in association with the rotation of the disc which was set to be removed through the powder supply tube and said grounding member.

[0025]

In the powder supplying apparatus according to claim 1, even if static electricity is generated by friction caused by rotation of the disk, the disk,
Since the charge can be released through the ground member, or the charge can be released through the disc, the output shaft, and the ground member, the disc is not charged,
There is no concern that the powder conveyed to the disk will be charged and aggregate.

According to the second aspect, the casing is not charged and there is no possibility that the powder adheres to the inner surface of the casing.

If the inspection window is provided as in the third aspect, the inside of the casing can be visually inspected. Even if static electricity is generated, the charge can be released through the inspection window, so that the inspection window is not charged and powder does not adhere to the inner surface. It does not hinder the inspection.

According to claim 4, the friction of the disk can be minimized.

In the powder supplying apparatus of the fifth aspect, even if static electricity is generated due to the rotation of the disk, the charge can be released through the plate body and the hopper, so that at least the inner surface of the hopper, that is, the hopper. The portion that can contact the powder is not charged, and there is no risk that the powder will adhere to the discharge port of the hopper and cause defective filling in the circumferential groove.

According to the sixth aspect, the inside of the hopper can be visually inspected, and the powder filling amount in the hopper can be easily grasped. Even if static electricity is generated, the charge can be released through the hopper, so that at least the inner surface of the hopper is not charged and powder does not adhere. In addition, there is no concern that it will interfere with visual inspection.

In the powder supply device of claim 7, even if static electricity is generated due to the rotation of the disk, the charge can be released through the plate body and the powder supply pipe. At least the inner surface of the tube, that is, the portion that can come into contact with the powder, is not charged, and there is no fear that the powder will adhere to the inner surface of the powder supply tube.

[0032]

EXAMPLES Examples will be described below, but the electrically conductive material here is not particularly limited, and conventionally known materials can be used, for example, metallic materials such as stainless steel, Ti, Cu, Ni. ; Various conductive ceramic materials; or
Metal powder (Cu, Ni, Ag, etc.), metal fiber (Fe,
Ni, stainless steel, etc.), carbon black, metallized inorganic compounds (zinc oxide, glass beads, titanium oxide, etc. surface coated with metal by metal sputtering method, metal deposition method, electroless plating method, etc.) A conductive resin or conductive rubber which is dispersed in a concentration to impart conductivity can be used. The use of a conductive engineering plastic such as Hytrel (trade name) sold by Toray DuPont Co., Ltd. does not hinder the present invention.

When only the surface or only the inner surface is made of a conductive material, a film made of the above-mentioned conductive material may be laminated, or a conventionally known conductive paint may be applied. Alternatively, an inner / outer double structure of a conductive material and a non-conductive material may be used.

When a conductive and elastic material is used, it is preferable to use the conductive rubber material, but the conductive engineering plastic also has elasticity. Of course, you can also use it.

FIG. 1 is a perspective view of a powder supply apparatus A showing an embodiment of the first invention, FIG. 2 is a partially exploded perspective view, and FIG. 3 is a longitudinal sectional view thereof.

In the figure, reference numeral 10 is a motor installed on a base 12, and reference numeral 14 is an output shaft of the motor. The output shaft 14 is connected to the lower portion of a pipe 18 having a small gear 16 mounted in the central portion in the axial direction.

Reference numeral 20 denotes a large gear mounted on the lower portion of a hard metal main shaft 22 extending in the vertical direction, and meshes with the small gear 16. Reference numeral 24 is the main shaft 22.
It is a disk that is attached to. However, the drive of the motor 10 causes the small gear 16 to rotate and the large gear 20 to rotate, which causes the main shaft 22 and the disk 24 to rotate.
Is designed to rotate. Reference numeral 26 is a bearing for rotatably supporting the main shaft 22.

The spindle 2 is provided at the center of the disk 24 in the radial direction.
2 penetrates and the upper end 22a of the main shaft 22 projects. A circumferential groove 28 extending in the circumferential direction is engraved on the upper surface of the disk 22. The disk 28 is made of a conductive material.

Reference numeral 30 is a planar circular casing made of a conductive material for accommodating the disk 24 therein. The casing 30 has a cylindrical casing body 30a.
And a lid plate 30b that is attached to the upper portion of the casing body 30a and closes the upper opening of the casing body 30a.
And a bottom plate 30c attached to the bottom of the casing body 30a.

The lid body 30b is provided with a hopper hole 32 and a powder supply pipe hole 34 penetrating the lid body 30b in the thickness direction at positions facing each other with a radial center portion therebetween. Further, as clearly shown in FIG. 2, a circular inspection window 36 for visually inspecting the inside of the casing 30 is provided. The inspection window 36 is formed by coating, for example, indium titanium oxide (InTiO _x ) on the inner surface of a transparent plate or a semitransparent plate made of glass or acrylic resin, or by using a conductive material such as aluminum or gold with a thickness of 10 Å to 1 μm. It is vapor-deposited to have conductivity. Alternatively, it is transparent or semitransparent as a whole made of a conductive material.

A lower portion of the casing body 30a is a flange 31 extending inward, and thrust rings 38 are attached to the upper surface of the flange 31 at predetermined circumferential intervals. The disk 24 is placed on the plurality of thrust rings 38 described above,
It supports the rotation of the disk 24. Further, outside the portion where the thrust ring 38 is provided, an air blow-up groove 40 that penetrates the flange 31 in the thickness direction at predetermined intervals in the circumferential direction.
Is provided. A ground wire A1 that allows the casing 30 to be grounded is provided.

A central opening 42 for inserting the main shaft 22 is provided in the central portion of the bottom plate 30c in the radial direction, and a concave portion 44 for air circulation extending in the circumferential direction is provided on the upper surface. . The concave portion 44 communicates with the air blowing groove 40, and the concave portion 44
Has a through hole 46 penetrating the bottom plate 30c at an arbitrary position.

The air pressure inside the casing 30 is higher than the air pressure outside. The air is introduced into the casing 30 through the through hole 46. That is, the air inlet pipe 4 extending from the air blowing device (not shown)
The tip of 8 is inserted into the through hole 46.

Reference numeral 50 denotes a nozzle plate body arranged on the disk 24 (see FIGS. 4, 5 and 6). The nozzle plate body 50 is made of a conductive material. Further, the nozzle plate body 50 has a shaft hole 52 formed in the center thereof for inserting the main shaft 22 therethrough.

Reference numeral 54 is a powder filling hole that penetrates the nozzle plate 50 in the thickness direction. Further, reference numeral 56 is a powder supply hole provided at a position facing the powder filling hole 54 with the shaft hole 52 interposed therebetween. This powder supply hole 56
Like the powder filling hole 54, penetrates the nozzle plate 50 in the thickness direction.

Reference numeral 58 is an air bypass passage that penetrates the nozzle plate 50, as clearly shown in FIG. In this embodiment, the air bypass passage 58 that penetrates the nozzle plate body 50 in an oblique direction is shown, but the invention is not limited to this, and the air bypass passage 58 may penetrate in the thickness direction. The air bypass passage 58 does not necessarily have to be provided, but an inlet for allowing air to flow into the lower side of the nozzle plate body 50,
It is provided separately from the course of the powder that is continuously conveyed as the disk 24 rotates, and the powder is merged in the middle part of the air flow and the powder is carried on the air flow and carried out. Since it is said that the amount of body carried out will be uniform,
If anything, it is preferable to provide the air bypass passage 58.

The powder filling hole 54 is composed of a fitting recess 60 which constitutes the upper half, and a small hole 62 which extends downward from the center of the fitting recess 60. Further, the powder supply hole 56 has a fitting recess 64 that constitutes the upper half.
And a small hole 66 extending downward from the center of the fitting recess 64.

As is apparent from FIGS. 4 and 5, both ends of the nozzle plate 50 are partially cut away. Reference numeral 68 indicates the cutout portion. Casing 30
The tips of a total of two locking shafts 70 inserted from the opposite positions of the casing body 30a in the above are fitted into the notches 68, respectively, so that the nozzle plate body 50 and the casing 30 are firmly fixed. There is. This allows
The nozzle plate 50 does not rotate even if the disc 24 rotates, and the disc 24 slides on the lower surface of the nozzle plate 50 as the disc 24 rotates. In the state where the nozzle plate body 50 is placed and fixed on the disk 24 as described above, the powder filling hole 54 and the powder supply hole 56 provided in the nozzle plate body 50 are located immediately on the circumferential groove 28. It is placed on the top and can communicate.

The upper surface of the disk 24 excluding the circumferential groove 28 is coated with TiO ₂ , TiN or the like to prevent wear. As a coating treatment method, a conventionally known method may be used. Thereby, the nozzle plate body 50
It is possible to minimize the abrasion of the upper surface of the disk 24 due to the friction with the.

Further, in this embodiment, the nozzle plate body 50 is
However, the present invention is not limited to this, and as shown in FIGS. 7 and 8, the first nozzle plate 72 having the powder filling hole 54 and the second nozzle plate having the powder supplying hole 56 are provided. Nozzle plate 74
You may use what connected and.

Reference numeral 76 is a powder supply pipe made of a conductive material. The powder supply pipe 76 allows the inside and the outside of the apparatus body 1 to communicate with each other, and the internal space thereof is provided so as to communicate with the powder supply hole 56 in the nozzle plate 50. The powder supply pipe 76 will be described.
Is composed of a thin tube portion 76b that constitutes the upper side and a fitting portion 76c that constitutes the lower side with the disc-shaped flange portion 76a as a boundary. The inner diameter of the fitting portion 76c is larger than the inner diameter of the thin tube portion 76c, but the outer periphery of the pipe 78 has elasticity and conductivity which are substantially the same as the inner diameter of the fitting portion 76c. The inner diameter of the thin tube portion 76b and that of the fitting portion 76c are substantially the same.

The lower end portion 78 of the pipe 78 is
a slightly protrudes from the lower side of the fitting portion 76c,
It plays a role of a cushioning material so that it can sufficiently cope with the waviness of the disk 24 due to the rotation of the disk 24, that is, the powder supply pipe 76 does not move vertically due to the waviness of the disk 24. Further, a ground wire A2 for grounding the powder supply pipe 76 extends from an arbitrary position of the powder supply pipe 76.

In the powder supply pipe 76 having the above-mentioned structure, the fitting portion 76c is penetrated through the powder supply pipe hole 34 provided in the lid 30b of the casing 30.
And the lower end of the fitting portion 76c is fitted into the fitting recess 64 provided in the nozzle plate 50. At this time, it is preferable that the ring-shaped packing 80 having conductivity and elasticity is fitted into the fitting recess 64 in advance (see FIG. 9).

In the present embodiment, the powder supply pipe 76 and the pipe 78 have different structures, but they may be integrally formed of the same material having elasticity and conductivity. Further, when the powder supply pipe 76 is more flexible, it is preferable because the position of the discharge port (not shown) in the powder supply pipe 76 can be easily changed. The pipe 76 and the fitting portion 76c of the powder supply pipe 76 may be integrally formed of the same material having elasticity and conductivity.

Reference numeral 82 is a hopper for quantitatively filling the circumferential groove 28 with powder, and the hopper 82 is
It is translucent so that the inside can be visually inspected. In other words, the hopper 82 is coated with indium titanium oxide (InTiO _x ) on the inner surface of a transparent body such as glass or synthetic resin, or is vapor-deposited with a conductive material such as aluminum or gold with a thickness of 10 Å to 1 μm to conduct electricity. Imparted or transparent,
A semi-transparent conductive film is attached. In addition, a part of the hopper 82 may be a transparent body or a semitransparent body to which the above-mentioned conductivity is imparted.

The hopper 82 does not necessarily have a light-transmitting property so that the inside of the hopper 82 can be inspected. However, by doing so, the filling amount of the powder inside the hopper 82 can be grasped at a glance. Therefore, it is preferable. In addition, the hopper 82
May be made of a conductive material not only on the inner surface but also entirely.

The hopper 82 includes a covered cylindrical body 82a forming an upper half, a chute portion 82b extending downward from the covered cylindrical body 82a, a fitting portion 82c extending downward from the chute portion 82b, and a hopper 82 of the hopper 82. It is composed of a stirring device 82d provided on the lid. The stirring device 8
A motor 83 for driving the 2d is installed on the hopper 82. Any motor may be used as the motor 83, but a brushless motor that drives relatively quietly or a small but high motor. It is preferable to use an ultrasonic motor that can expect torque. Also, if an ultrasonic motor is used, high-frequency vibration (for example, Fukoku Co., Ltd.)
42kH if you use USR-30 ultrasonic motor
(vibration of z) can be applied to the hopper 82, and this vibration can remove the powder that has inadvertently adhered to the inner surface of the hopper 82. When the brushless motor is adopted, such an expectation cannot be expected, but a conventionally known ultrasonic transducer is separately provided in the hopper 8.
The same effect can be obtained by mounting it on the outside of 2.

A ground wire A3 for grounding the inner surface of the hopper 82 extends from an arbitrary position of the hopper 82. Reference numeral 84 is an opening formed at the lower end of the hopper 82. The hopper 82 having the above-described configuration is provided in a state in which the fitting portion 82c is placed on the lid of the casing 30 in a state where the fitting portion 82c penetrates the hole 32 for the hopper provided in the lid of the casing 30. The lower end of the portion 82c is fitted into the fitting recess 60 provided in the nozzle plate body 50, and the inside of the hopper 82 and the nozzle plate body 5 are covered.
It is possible to communicate with the powder filling hole 54 of No. 0.

As shown in FIG. 10, a pipe 86 having elasticity and conductivity is inserted inside the fitting portion 82c of the hopper 82. The lower end portion 86a of the pipe 86 slightly projects from the lower side of the fitting portion 82c, so that it can sufficiently cope with the waviness of the disk 24 due to the rotation of the disk 24, that is, the waviness of the disk 24. Along with this, it plays a role of a cushioning material so that the hopper 82 does not move up and down. When the fitting portion 82c is fitted into the fitting recess 60 provided in the nozzle plate 80, it is preferable that the conductive ring-shaped packing 88 is fitted into the fitting recess 60 in advance.

In the present embodiment, the hopper 82 and the pipe 86 have different structures, but they may be integrally molded from the same material having elasticity and conductivity. Alternatively, the pipe 86 and the hopper 8
The fitting portion 82c in 2 may be integrally formed of the same material having elasticity and conductivity.

The air pressure inside the hopper 82 is higher than the air pressure inside the casing 30. Reference numeral 90 is a through hole penetrating the wall surface of the hopper.
Air is fed into the hopper 82 via the. That is, the tip of the air inlet pipe 92 extending from the air blowing device (not shown) is inserted into the through hole 90.

Hereinafter, the principle of powder delivery in the powder feeder A having the above-mentioned structure, that is, the principle of quantitatively sending powder from the inside of the hopper 82 to the outside of the apparatus main body 1 through the powder feed pipe 76. Will be briefly described with reference to FIG.

That is, as described above, the casing 30
The air pressure inside is higher than the air pressure outside. Due to this pressure difference, air flows into the air bypass passage 58 from the upper opening 58a of the air bypass passage 58 in the nozzle plate body 50, and the air bypass passage 58.
And flows into the circumferential groove 28 located below this.
The air flowing into the peripheral groove 28 flows into the peripheral groove 28, flows into the powder supply pipe 76 through the small holes 66 and the supply recesses 64, and goes out of the apparatus main body 1. The arrows in FIG. 6 indicate the flow of air.

When the powder in the circumferential groove 28 reaches the position corresponding to the lower opening 58b of the air bypass passage 58 as the disk 24 rotates, the powder merges with the air flow as described above. However, a fixed amount is supplied to the outside of the apparatus main body 1 along with the flowing air, and the fixed amount is mixed into the fluid to be measured. The powder that has reached the vicinity of the lower opening 56a of the powder supply hole 56 due to the above-described air flow hits the protruding portion 50a provided on the lower surface of the nozzle plate body 50 so as to fit into the circumferential groove 28. , And then the upward direction is changed to be guided to the powder supply pipe 76 through the powder supply hole 56.

The ground structure of the powder supplying apparatus A will be described below. In FIG. 11, reference numeral 94 denotes a recess 94 that extends axially in the radial center of the upper surface of the main shaft 22.
Is. The earth member 61 that allows the disc 24 and the casing 30 to conduct electricity is composed of an earth pin 96 arranged in the recess 94 and a coil spring 98 also arranged in the recess 94. The earth pin 96 and the coil spring 98 are each made of a conductive material, or the surfaces thereof are coated with a conductive material.

The ground pin 96 has a hemispherical head portion 96a, and is constantly urged upward by the coil spring 98, so that the upper end portion of the ground pin 96 is always on the lower surface of the lid 30b in the casing 30. Abutting. As a result, even if static electricity is generated on the disk 24 as the disk 24 rotates, the charges can be released through the casing 30 and the ground wire A1. Further, even if static electricity is generated, the electric charge can be released through the inspection window 36, so there is no concern that the inspection window 36 will be charged, and the powder adheres to the inner surface of the inspection window 36, making visual inspection impossible. There is no fear.

Even if static electricity is generated due to the rotation of the disk 24, the charge can be released through the nozzle body 50, the hopper 82 and the ground wire A3, so that the inner surface of the hopper 82 is not charged and the hopper 82 is not charged. No powder adheres to the inner surface of the. Therefore, the translucency of the hopper 82 is maintained, and it does not hinder the visual inspection of the inside. Further, since the pipe 86 provided as a cushioning material has conductivity so that the hopper 82 does not move up and down due to the waviness of the disk 24, there is no concern that the pipe 86 itself will be charged, There is no possibility that powder will adhere to the inner surface of the pipe 86 and cause defective filling of the circumferential groove 28.

As the disk 24 is charged, the nozzle body 50,
Since the electric charge can be released through the powder supply pipe 76 and the ground wire A2, the powder supply pipe 76 is not charged and the powder does not adhere to the inner surface of the powder supply pipe 76. In addition, the powder supply pipe 76
Pipe 7 provided as a cushioning material to prevent the vertical movement of
Since 8 has conductivity, there is no fear that the pipe 78 itself will be charged, and there is no fear that powder will adhere to the inner surface of the pipe 78. Other than the above-mentioned ground structure, the structure shown in FIG. 12 may be used. That is, a recess 93 extending in the radial direction of the disk 24 is provided in a portion of the inner wall of the casing body 30a corresponding to the peripheral surface of the disk 24. In the recess 93,
A ground ball 95 made of a conductive material or having a surface coated with a conductive material is inserted. Since the earth ball 95 is constantly biased toward the disc 24 by the coil spring 97 also inserted in the recess 93, the earth ball 95 is always urged toward the disc 24 while responding to the eccentricity of the disc 24. It comes into contact with the peripheral surface. As a result, even if static electricity is generated in the disk 24 due to friction accompanying the rotation of the disk 24, the electric charge can be released through the casing 30 and the ground wire A1.

The above-mentioned earth structure may be used not only for the peripheral surface of the disk 24 but also for the lower surface and the upper surface of the disk 24. In this case, eccentric stress may be applied to the disk 24. It is not preferable because it can be considered.

In addition, the static electricity may be directly removed not only from the upper end of the main shaft 22 but also from the lower end of the main shaft or other parts.

In the present embodiment, the powder supplying apparatus A having the antistatic structure of the hopper 82, the antistatic structure of the powder supply pipe 76, and the antistatic structure of the disk 24 and the casing 30 is shown. It does not necessarily mean that all the three structures must be provided, and if any one of the above structures is provided, a sufficient effect can be recognized.

Further, the disk 24, the nozzle plate 50 and the powder supply pipe 76 used in the present embodiment are all made of a conductive material, but the present invention is not limited to this, and the disk 24,
The same effect can be obtained by using a nozzle plate 50 whose surface is made of a conductive material. As the powder supply pipe 76, a place that can come into contact with the powder, that is, one whose inner surface is made of a conductive material may be used. In this case, the ground wire A2 may be provided so that the inner surface of the powder supply pipe 76 can be grounded.

[0073]

According to the powder supplying apparatus of the present invention, even if static electricity is generated by friction caused by the rotation of the disc, the electric charge can be released through the disc, so that the disc is not charged, The powder filled in the circumferential groove of the disk will not be charged and aggregate. Thereby, the powder can be quantitatively supplied.

Even if static electricity is generated by friction due to the rotation of the disk, the electric charge can be released through the casing, so that the disk and the casing are not charged,
No powder adheres to the inner surface of the casing. Further, since the inner surface of the inspection window is provided with conductivity, it does not interfere with the visual inspection inside the apparatus body.

Even if static electricity is generated by friction caused by the rotation of the disk, the charge can be released through the hopper, so that the hopper is not charged and the powder is not attached to the inner surface of the hopper. In particular, since the powder is not attached to the discharge port of the hopper and the discharge port is not blocked, the problem of defective filling in the circumferential groove does not occur.

Even if static electricity is generated due to friction caused by the rotation of the disk, the charge can be released through the powder supply passage, so that the powder supply passage is not charged and the inner surface of the powder supply pipe is not charged. No powder adheres.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a powder supply pipe showing an embodiment of the present invention.

FIG. 2 is a partial perspective view of FIG.

FIG. 3 is an exploded perspective view of FIG.

FIG. 4 is a plan view of a nozzle plate body.

FIG. 5 is a bottom view of FIG.

6 is an enlarged cross-sectional view taken along the line AA in FIG.

FIG. 7 is a plan view showing another embodiment of the nozzle body.

8 is a sectional view taken along line BB in FIG.

FIG. 9 is an exploded partial cross-sectional view showing fitting of a powder supply pipe into a nozzle plate.

FIG. 10 is an exploded partial cross-sectional view showing fitting of a hopper into a nozzle plate body.

FIG. 11 is a cross-sectional view of an essential part showing a structure that enables electrical conduction between a main shaft and a lid of a casing.

FIG. 12 is a cross-sectional view of an essential part showing a structure for enabling electrical communication between a disc and a casing body of a casing.

FIG. 13 is a partially cutaway perspective view showing a conventional powder supply device.

FIG. 14 is an enlarged plan view of the blowing nozzle in the previous figure.

FIG. 15 is a cross-sectional view taken along the line DD in FIG.

[Explanation of symbols]

 A ... Powder feeder A1, A2, A3 ... Ground wire 24 ... Disk 28 ... Circumferential groove 30 ... Casing 30a ... Casing body 30b ... Lid body 30c ... Bottom body 36 ... Inspection window 50 ...... Nozzle plate 54 …… Powder filling hole 56 …… Powder supply hole 61 …… Grounding member 76 …… Powder supply pipe 82 …… Hopper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukiyoshi Fukano 4-1-2 Hirano-cho, Chuo-ku, Osaka City Osaka Gas Co., Ltd. (72) Masamichi Ipponmatsu 4-1-2 Hirano-cho, Chuo-ku, Osaka Within Osaka Gas Co., Ltd.

Claims (7)

[Claims] 1. A casing having a cylindrical shape with a bottom and a lid, a disc rotatably provided inside the casing, a circumferential groove extending in a circumferential direction provided on an upper surface of the disc, and the disc. A plate body which is disposed on the casing and fixed to the casing, and in which a powder filling hole and a powder supply hole penetrating in the thickness direction are provided at positions corresponding to the circumferential groove, respectively, and the circumferential groove. A hopper for filling the powder through the powder filling hole, and a powder supply pipe for guiding the powder delivered from the circumferential groove through the powder supply hole to the outside. A powder supply device comprising: a disk, wherein at least the surface of the disk is made of a conductive material, and a grounding member for grounding the disk is provided, and the disk is generated as the disk rotates. Removes static electricity via grounding member Powder supplying device being characterized in that killed manner. 2. The casing is made of a conductive material, and an inner grounding member that allows the disc and the casing to conduct electricity and an outer grounding member that allows the casing to be grounded are provided to prevent the disc from rotating. The powder supplying apparatus according to claim 1, wherein static electricity generated in the disk is removed via the inner earth member, the casing, and the outer earth member. 3. The inspection window according to claim 2, wherein at least a part of the casing is formed of an inspection window made of a transparent body or a semitransparent body, and at least an inner surface of the inspection window has conductivity. The powder supply device described. 4. The disk according to claim 1, wherein the disk is entirely made of a conductive material, and the sliding surface of the disk with respect to the plate body is provided with a wear preventing coating. Powder feeder. 5. A casing having a cylindrical shape with a bottom and a lid, a disc rotatably provided inside the casing, a circumferential groove extending in a circumferential direction provided on an upper surface of the disc, and the disc. And a plate body provided with a powder filling hole and a powder supply hole penetrating in a thickness direction at a position corresponding to the peripheral groove, respectively, in a state of being connected to the plate body, A hopper for filling the circumferential groove with the powder through the powder filling hole, and a powder which is in a state of being connected to the plate body and which is sent out from the circumferential groove through the powder feeding hole. A powder supply device comprising a powder supply pipe for guiding the outside of the device main body, wherein at least the surfaces of the disk and the plate and at least the inner surface of the hopper are made of a conductive material, and the conductive property of the hopper The part composed of material can be grounded A powder supply device, characterized in that a grounding member is provided to enable the static electricity generated by the rotation of the disk to be removed via the hopper and the grounding member. 6. The powder feeder according to claim 5, wherein at least a part of the hopper is made of a transparent material or a semitransparent material, and at least the inner surface of the hopper has conductivity. 7. A casing having a cylindrical shape with a bottom and a lid, a disc rotatably provided inside the casing, a circumferential groove extending in a circumferential direction provided on an upper surface of the disc, and the disc. And a plate body provided with a powder filling hole and a powder feeding hole penetrating in a thickness direction at positions corresponding to the circumferential groove, and the powder filling hole in the circumferential groove. A hopper for filling the powder through the powder, and a powder for guiding the powder sent from the peripheral groove through the powder supply hole to the outside of the apparatus main body in a state of being connected to the plate body. A powder supply device including a supply pipe, wherein at least the surfaces of the disk and the plate and at least the inner surface of the powder supply pipe are made of a conductive material, and the powder supply pipe is made of a conductive material. A grounding member that enables grounding of the The powder supply device is characterized in that static electricity generated by the rotation of the disk can be removed through the powder supply pipe and the ground member.